A simple class for creating and returning model matrices

ModelMatrix.h

#pragma once

#include <glm/glm.hpp>
#include <glm/gtx/transform.hpp>

class ModelMatrix
{
	public: 

	glm::mat4 GetModel()
	{
		return model;
	}

	void SetMatrix(glm::mat4 mvp)
	{
		shader.UseProgram();
		shader.SetMatrix( mvp );
	}

	void Render() const
	{
		shader.UseProgram();
		glDrawArrays(GL_TRIANGLES, 0, positions.size() / 3 );
	}

	void ResetMatrix()
	{
		model = glm::mat4(1.0f); 
		rotate = glm::mat4(1.0f);
		scale = glm::mat4(1.0f);
		translate = glm::mat4(1.0f);
	}

	void Translate(const glm::vec3 &axis)
	{
		translate = glm::translate(translate, axis); 
		UpdateMatrix();
	}

	void Rotate(glm::vec3 axis, double angle)
	{
		rotate = glm::rotate(rotate, angle, axis);
		UpdateMatrix();
	}

	void Scale(glm::vec3 axis)
	{
		scale = glm::scale(scale, axis);
		UpdateMatrix();
	}

	void UpdateMatrix()
	{
		model = scale * translate * rotate ;
	}

	private:
	glm::mat4 model;
	glm::mat4 rotate;
	glm::mat4 translate;
	glm::mat4 scale;
};